author | hseigel |
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/* |
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* Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_IMPLEMENTATION_PARNEW_PAROOPCLOSURES_INLINE_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_PARNEW_PAROOPCLOSURES_INLINE_HPP |
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#include "gc_implementation/parNew/parNewGeneration.hpp" |
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#include "gc_implementation/parNew/parOopClosures.hpp" |
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#include "memory/cardTableRS.hpp" |
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template <class T> inline void ParScanWeakRefClosure::do_oop_work(T* p) { |
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assert (!oopDesc::is_null(*p), "null weak reference?"); |
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oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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// weak references are sometimes scanned twice; must check |
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// that to-space doesn't already contain this object |
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if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) { |
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// we need to ensure that it is copied (see comment in |
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// ParScanClosure::do_oop_work). |
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Klass* objK = obj->klass(); |
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markOop m = obj->mark(); |
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oop new_obj; |
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if (m->is_marked()) { // Contains forwarding pointer. |
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new_obj = ParNewGeneration::real_forwardee(obj); |
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} else { |
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size_t obj_sz = obj->size_given_klass(objK); |
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new_obj = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state, |
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obj, obj_sz, m); |
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} |
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oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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} |
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} |
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inline void ParScanWeakRefClosure::do_oop_nv(oop* p) { ParScanWeakRefClosure::do_oop_work(p); } |
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inline void ParScanWeakRefClosure::do_oop_nv(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); } |
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template <class T> inline void ParScanClosure::par_do_barrier(T* p) { |
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assert(generation()->is_in_reserved(p), "expected ref in generation"); |
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assert(!oopDesc::is_null(*p), "expected non-null object"); |
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oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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// If p points to a younger generation, mark the card. |
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if ((HeapWord*)obj < gen_boundary()) { |
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rs()->write_ref_field_gc_par(p, obj); |
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} |
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} |
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template <class T> |
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inline void ParScanClosure::do_oop_work(T* p, |
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bool gc_barrier, |
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bool root_scan) { |
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assert((!Universe::heap()->is_in_reserved(p) || |
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generation()->is_in_reserved(p)) |
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&& (generation()->level() == 0 || gc_barrier), |
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"The gen must be right, and we must be doing the barrier " |
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"in older generations."); |
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T heap_oop = oopDesc::load_heap_oop(p); |
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if (!oopDesc::is_null(heap_oop)) { |
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oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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if ((HeapWord*)obj < _boundary) { |
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#ifndef PRODUCT |
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if (_g->to()->is_in_reserved(obj)) { |
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tty->print_cr("Scanning field (" PTR_FORMAT ") twice?", p); |
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GenCollectedHeap* gch = (GenCollectedHeap*)Universe::heap(); |
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Space* sp = gch->space_containing(p); |
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oop obj = oop(sp->block_start(p)); |
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assert((HeapWord*)obj < (HeapWord*)p, "Error"); |
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tty->print_cr("Object: " PTR_FORMAT, (void *)obj); |
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tty->print_cr("-------"); |
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obj->print(); |
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tty->print_cr("-----"); |
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tty->print_cr("Heap:"); |
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tty->print_cr("-----"); |
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gch->print(); |
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ShouldNotReachHere(); |
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} |
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#endif |
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// OK, we need to ensure that it is copied. |
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// We read the klass and mark in this order, so that we can reliably |
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// get the size of the object: if the mark we read is not a |
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// forwarding pointer, then the klass is valid: the klass is only |
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// overwritten with an overflow next pointer after the object is |
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// forwarded. |
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Klass* objK = obj->klass(); |
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markOop m = obj->mark(); |
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oop new_obj; |
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if (m->is_marked()) { // Contains forwarding pointer. |
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new_obj = ParNewGeneration::real_forwardee(obj); |
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oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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#ifndef PRODUCT |
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if (TraceScavenge) { |
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gclog_or_tty->print_cr("{%s %s ( " PTR_FORMAT " ) " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", |
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"forwarded ", |
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new_obj->klass()->internal_name(), p, (void *)obj, (void *)new_obj, new_obj->size()); |
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} |
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#endif |
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} else { |
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size_t obj_sz = obj->size_given_klass(objK); |
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new_obj = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m); |
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oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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if (root_scan) { |
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// This may have pushed an object. If we have a root |
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// category with a lot of roots, can't let the queue get too |
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// full: |
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(void)_par_scan_state->trim_queues(10 * ParallelGCThreads); |
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} |
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} |
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if (is_scanning_a_klass()) { |
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do_klass_barrier(); |
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} else if (gc_barrier) { |
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// Now call parent closure |
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par_do_barrier(p); |
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} |
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} |
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} |
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} |
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inline void ParScanWithBarrierClosure::do_oop_nv(oop* p) { ParScanClosure::do_oop_work(p, true, false); } |
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inline void ParScanWithBarrierClosure::do_oop_nv(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); } |
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inline void ParScanWithoutBarrierClosure::do_oop_nv(oop* p) { ParScanClosure::do_oop_work(p, false, false); } |
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inline void ParScanWithoutBarrierClosure::do_oop_nv(narrowOop* p) { ParScanClosure::do_oop_work(p, false, false); } |
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#endif // SHARE_VM_GC_IMPLEMENTATION_PARNEW_PAROOPCLOSURES_INLINE_HPP |